Github user tedyu commented on a diff in the pull request:
https://github.com/apache/spark/pull/7882#discussion_r36114103
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
---
@@ -614,8 +614,9 @@ object DateTimeUtils {
*/
def dateAddMonths(days: Int, months: Int): Int = {
val absoluteMonth = (getYear(days) - YearZero) * 12 + getMonth(days) -
1 + months
- val currentMonthInYear = absoluteMonth % 12
- val currentYear = absoluteMonth / 12
+ val nonNegativeMonth = if (absoluteMonth >= 0) absoluteMonth else 0
+ val currentMonthInYear = nonNegativeMonth % 12
+ val currentYear = nonNegativeMonth / 12
--- End diff --
/% is not defined for Int.
I read the notion in a Scala book which I have returned. I will read more
once I have that book back.
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